"You cannot do wrong and feel right. It is impossible."
{Ezra T. Benson}
I don't entirely think that people know every single thing that is wrong. In some cases, there are people who don't know what they are doing or didn't know the things they were doing, was wrong. So the "satisfaction" they get from doing something wrong should not have much importance or satisfaction. Instead, we should clarify the facts; let them understand that their actions are wrong and that there are consequences for them. We must give people the benefit of the doubt, but still be alert and cautios, not ignorant.